Unexpected behaviour from the 'in' operator

[Rene Pijlman]

Andrew Bennetts:
[testing for identity instead of equality]
>On the other hand, it could be genuinely useful if the objects 
>had very slow equality operators... 

If this is true I guess the equality operator could be optimized
to first check for identity, and only test non-identical objects
for equality.

-- 
René Pijlman

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